Unique insights into the design of low-strain single-crystalline Ni-rich cathodes with superior cycling stability

• DOI: 10.1073/pnas.2317282121
• Publication Date: 2024-02-28T18:01:01Z
• Authors: Qiang Han; Haifeng Yu; Lele Cai; Ling Chen; Chunzhong Li; Hao Jiang
• Keywords: Particle (ecology)

Micro-sized single-crystalline Ni-rich cathodes are emerging as prominent candidates owing to their larger compact density and higher safety compared with poly-crystalline counterparts, yet the uneven stress distribution lattice oxygen loss result in intragranular crack generation planar gliding. Herein, taking LiNi 0.83 Co 0.12 Mn 0.05 O 2 an example, optimal particle size of 3.7 µm is predicted by simulating distributions at various states charge relationship fracture free-energy, then, fitted curves calcination temperature time further built, which guides successful synthesis target-sized particles ( m -NCM83) highly ordered layered structure a unique high-temperature short-duration pulse lithiation strategy. The -NCM83 significantly reduces strain energy, Li/O loss, cationic mixing, thereby inhibiting formation, gliding, surface degradation. Accordingly, m-NCM83 exhibits superior cycling stability structural integrity dual-doped shows excellent 88.1% capacity retention.